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<br />~ <br />~ <br />~ <br />~ <br />o <br />o <br /> <br />ABSTRACT <br /> <br />Irrigation return flows in the Upper Colorado River Basin <br />carry large salt loads as a result of contact with the saline <br />soils and the marine derived geologic substratm~. The Grand <br />Valley of western Colorado is a major contributor to the salinity <br />problems of the basin and is, therefore, a logic:al region to <br />test the effectiveness of agricultural salinity control alterna- <br />tives. This study emphasized the implementation of on-farm <br />salinity control alternatives; primarily evaluating irrigation <br />scheduling, furrow irrigation, sprinkler irrigation, and trickle <br />irrigation. Border irrigation was also evaluated, but was not <br />implemented as part of this study. The cost-effectiveness of <br />the various on-farm alternatives in the Grand Valley is <br />summarized and presented in this report. <br /> <br />This report is the second in a series of reports submitted <br />in fulfillment of Grant No. S-802985 by Colorado State University <br />under the sponsorship of the U.S. Environmental Protection <br />Agency. This report covers the period February 18, 1974 to <br />February 17, 1977 and work was completed as of June 17, 1977. <br /> <br /> <br />v <br /> <br />